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GMAT Math Question - Please Help [#permalink]
13 Nov 2006, 20:33
I had a question regarding the math section in the GMAT. I guess this would apply to either PS or DS. If the problem states that there are two variables, x and y, but does not explicitly state that they are distinct, can we always assume that x and y can be equal? This has always created some confusion for me as I have progressed in my studes.
If nothing states that x != y, then x could be equal y. Yes.
Concretly, the number of possibilities of x=y also depends on whether x is relatively defined to y by an equation such as the one of a line : y = 3*x+2. For this case, we know that we have only couple (x,y) that matchs x=y.... when x = -1.